They're encouraging residents to vote, especially with the nation's top office on the ballot. Along with the presidential candidates, Pennsylvania voters will have the opportunity to pick U.S. Senatorial candidates, as well as other local races in the party they're affiliated with. Election officials say they expect a bigger turnout for this year's primary elections compared to last year.

"It allows the voters to determine which candidates that will move on to the November election. If a voter does not go out and support their favorite candidate tomorrow, they may not in fact move forward, because they may not get enough votes," says Jean Byers, the Deputy Chief Clerk for Franklin County Board of Elections.